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-rw-r--r--core/s2smanager.lua116
1 files changed, 102 insertions, 14 deletions
diff --git a/core/s2smanager.lua b/core/s2smanager.lua
index 0589e024..3613707c 100644
--- a/core/s2smanager.lua
+++ b/core/s2smanager.lua
@@ -27,6 +27,7 @@ local st = require "stanza";
local stanza = st.stanza;
local nameprep = require "util.encodings".stringprep.nameprep;
+local fire_event = require "core.eventmanager".fire_event;
local uuid_gen = require "util.uuid".generate;
local logger_init = require "util.logger".init;
@@ -37,11 +38,14 @@ local sha256_hash = require "util.hashes".sha256;
local dialback_secret = uuid_gen();
-local adns = require "net.adns";
-
+local adns, dns = require "net.adns", require "net.dns";
+local config = require "core.configmanager";
+local connect_timeout = config.get("*", "core", "s2s_timeout") or 60;
local dns_timeout = config.get("*", "core", "dns_timeout") or 60;
+local max_dns_depth = config.get("*", "core", "dns_max_depth") or 3;
incoming_s2s = {};
+_G.prosody.incoming_s2s = incoming_s2s;
local incoming_s2s = incoming_s2s;
module "s2smanager"
@@ -126,13 +130,26 @@ function new_incoming(conn)
end
open_sessions = open_sessions + 1;
local w, log = conn.write, logger_init("s2sin"..tostring(conn):match("[a-f0-9]+$"));
+ session.log = log;
session.sends2s = function (t) log("debug", "sending: %s", tostring(t)); w(tostring(t)); end
incoming_s2s[session] = true;
+ add_task(connect_timeout, function ()
+ if session.conn ~= conn or
+ session.type == "s2sin" then
+ return; -- Ok, we're connect[ed|ing]
+ end
+ -- Not connected, need to close session and clean up
+ (session.log or log)("warn", "Destroying incomplete session %s->%s due to inactivity",
+ session.from_host or "(unknown)", session.to_host or "(unknown)");
+ session:close("connection-timeout");
+ end);
return session;
end
function new_outgoing(from_host, to_host)
- local host_session = { to_host = to_host, from_host = from_host, notopen = true, type = "s2sout_unauthed", direction = "outgoing" };
+ local host_session = { to_host = to_host, from_host = from_host, host = from_host,
+ notopen = true, type = "s2sout_unauthed", direction = "outgoing" };
+
hosts[from_host].s2sout[to_host] = host_session;
local log;
@@ -173,7 +190,7 @@ function attempt_connection(host_session, err)
if not err then -- This is our first attempt
log("debug", "First attempt to connect to %s, starting with SRV lookup...", to_host);
host_session.connecting = true;
- local answer, handle;
+ local handle;
handle = adns.lookup(function (answer)
handle = nil;
host_session.connecting = nil;
@@ -235,6 +252,47 @@ function attempt_connection(host_session, err)
end
function try_connect(host_session, connect_host, connect_port)
+ host_session.connecting = true;
+ local handle;
+ handle = adns.lookup(function (reply)
+ handle = nil;
+ host_session.connecting = nil;
+
+ -- COMPAT: This is a compromise for all you CNAME-(ab)users :)
+ if not (reply and reply[#reply] and reply[#reply].a) then
+ local count = max_dns_depth;
+ reply = dns.peek(connect_host, "CNAME", "IN");
+ while count > 0 and reply and reply[#reply] and not reply[#reply].a and reply[#reply].cname do
+ log("debug", "Looking up %s (DNS depth is %d)", tostring(reply[#reply].cname), count);
+ reply = dns.peek(reply[#reply].cname, "A", "IN") or dns.peek(reply[#reply].cname, "CNAME", "IN");
+ count = count - 1;
+ end
+ end
+ -- end of CNAME resolving
+
+ if reply and reply[#reply] and reply[#reply].a then
+ log("debug", "DNS reply for %s gives us %s", connect_host, reply[#reply].a);
+ return make_connect(host_session, reply[#reply].a, connect_port);
+ else
+ log("debug", "DNS lookup failed to get a response for %s", connect_host);
+ if not attempt_connection(host_session, "name resolution failed") then -- Retry if we can
+ log("debug", "No other records to try for %s - destroying", host_session.to_host);
+ destroy_session(host_session); -- End of the line, we can't
+ end
+ end
+ end, connect_host, "A", "IN");
+
+ -- Set handler for DNS timeout
+ add_task(dns_timeout, function ()
+ if handle then
+ adns.cancel(handle, true);
+ end
+ end);
+
+ return true;
+end
+
+function make_connect(host_session, connect_host, connect_port)
host_session.log("info", "Beginning new connection attempt to %s (%s:%d)", host_session.to_host, connect_host, connect_port);
-- Ok, we're going to try to connect
@@ -257,11 +315,22 @@ function try_connect(host_session, connect_host, connect_port)
-- otherwise it will assume it is a new incoming connection
cl.register_outgoing(conn, host_session);
- local w = conn.write;
+ local w, log = conn.write, host_session.log;
host_session.sends2s = function (t) log("debug", "sending: %s", tostring(t)); w(tostring(t)); end
conn.write(format([[<stream:stream xmlns='jabber:server' xmlns:db='jabber:server:dialback' xmlns:stream='http://etherx.jabber.org/streams' from='%s' to='%s' version='1.0' xml:lang='en'>]], from_host, to_host));
log("debug", "Connection attempt in progress...");
+ add_task(connect_timeout, function ()
+ if host_session.conn ~= conn or
+ host_session.type == "s2sout" or
+ host_session.connecting then
+ return; -- Ok, we're connect[ed|ing]
+ end
+ -- Not connected, need to close session and clean up
+ (host_session.log or log)("warn", "Destroying incomplete session %s->%s due to inactivity",
+ host_session.from_host or "(unknown)", host_session.to_host or "(unknown)");
+ host_session:close("connection-timeout");
+ end);
return true;
end
@@ -269,10 +338,16 @@ function streamopened(session, attr)
local send = session.sends2s;
-- TODO: #29: SASL/TLS on s2s streams
- session.version = 0; --tonumber(attr.version) or 0;
+ session.version = tonumber(attr.version) or 0;
+
+ if session.secure == false then
+ session.secure = true;
+ end
if session.version >= 1.0 and not (attr.to and attr.from) then
- log("warn", (session.to_host or "(unknown)").." failed to specify 'to' or 'from' hostname as per RFC");
+
+ (session.log or log)("warn", "Remote of stream "..(session.from_host or "(unknown)").."->"..(session.to_host or "(unknown)")
+ .." failed to specify to (%s) and/or from (%s) hostname as per RFC", tostring(attr.to), tostring(attr.from));
end
if session.direction == "incoming" then
@@ -284,15 +359,23 @@ function streamopened(session, attr)
(session.log or log)("debug", "incoming s2s received <stream:stream>");
send("<?xml version='1.0'?>");
send(stanza("stream:stream", { xmlns='jabber:server', ["xmlns:db"]='jabber:server:dialback',
- ["xmlns:stream"]='http://etherx.jabber.org/streams', id=session.streamid, from=session.to_host }):top_tag());
+ ["xmlns:stream"]='http://etherx.jabber.org/streams', id=session.streamid, from=session.to_host, version=(session.version > 0 and "1.0" or nil) }):top_tag());
if session.to_host and not hosts[session.to_host] then
-- Attempting to connect to a host we don't serve
session:close({ condition = "host-unknown"; text = "This host does not serve "..session.to_host });
return;
end
if session.version >= 1.0 then
- send(st.stanza("stream:features")
- :tag("dialback", { xmlns='urn:xmpp:features:dialback' }):tag("optional"):up():up());
+ local features = st.stanza("stream:features");
+
+ if session.to_host then
+ hosts[session.to_host].events.fire_event("s2s-stream-features", { session = session, features = features });
+ else
+ (session.log or log)("warn", "No 'to' on stream header from %s means we can't offer any features", session.from_host or "unknown host");
+ end
+
+ log("debug", "Sending stream features: %s", tostring(features));
+ send(features);
end
elseif session.direction == "outgoing" then
-- If we are just using the connection for verifying dialback keys, we won't try and auth it
@@ -313,10 +396,14 @@ function streamopened(session, attr)
end
session.send_buffer = nil;
- if not session.dialback_verifying then
- initiate_dialback(session);
- else
- mark_connected(session);
+ -- If server is pre-1.0, don't wait for features, just do dialback
+ if session.version < 1.0 then
+ if not session.dialback_verifying then
+ log("debug", "Initiating dialback...");
+ initiate_dialback(session);
+ else
+ mark_connected(session);
+ end
end
end
@@ -366,6 +453,7 @@ function make_authenticated(session, host)
return true;
end
+-- Stream is authorised, and ready for normal stanzas
function mark_connected(session)
local sendq, send = session.sendq, session.sends2s;
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-03 04:13:09 +0000